1.21-alpha1 bootstrap local fails with nil pointer dereference

$ juju bootstrap --show-log
2014-09-22 15:19:58 INFO juju.cmd supercommand.go:37 running juju [1.21-alpha1-trusty-amd64 gc]
2014-09-22 15:19:58 INFO juju.provider.local environprovider.go:154 checking state port
2014-09-22 15:19:58 INFO juju.provider.local environprovider.go:154 checking API port
2014-09-22 15:19:59 INFO juju.provider.local environprovider.go:43 opening environment "local"
Bootstrap failed, destroying environment
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x40 pc=0x4e0957]

goroutine 1 [running]:
runtime.panic(0xd57c40, 0x1b6b9e8)
 /usr/lib/go/src/pkg/runtime/panic.c:266 +0xb6
github.com/juju/juju/environs.Destroy(0x0, 0x0, 0x7f6d123378e0, 0xc210136b20, 0x1, ...)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/environs/open.go:291 +0x27
main.destroyPreparedEnviron(0xc21010b190, 0x0, 0x0, 0x7f6d123378e0, 0xc210136b20, ...)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/common.go:27 +0x117
main.func·020()
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/common.go:65 +0x6a
main.func·018()
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/bootstrap.go:188 +0x87
main.(*BootstrapCommand).Run(0xc21006c600, 0xc21010b190, 0x7f6d1232be10, 0xc210191b90)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/bootstrap.go:260 +0x2fd
github.com/juju/juju/cmd/envcmd.(*environCommandWrapper).Run(0xc2101260c0, 0xc21010b190, 0xb9c860, 0xc2101369f0)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/envcmd/environmentcommand.go:1 +0x3d
main.(*envCmdWrapper).Run(0xc2101260e0, 0xc21010b190, 0x0, 0x0)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/addmachine.go:1 +0x3d
github.com/juju/cmd.(*SuperCommand).Run(0xc2101f66e0, 0xc21010b190, 0xc21010b190, 0x0)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/cmd/supercommand.go:321 +0x3ca
github.com/juju/cmd.Main(0x7f6d123375c0, 0xc2101f66e0, 0xc21010b190, 0xc21000a010, 0x2, ...)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/cmd/cmd.go:247 +0x283
main.Main(0xc21000a000, 0x3, 0x3)
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/main.go:76 +0xada
main.main()
 /build/buildd/juju-core-1.21-alpha1/src/github.com/juju/juju/cmd/juju/main.go:172 +0x44

goroutine 3 [syscall]:
os/signal.loop()
 /usr/lib/go/src/pkg/os/signal/signal_unix.go:21 +0x1e
created by os/signal.init·1
 /usr/lib/go/src/pkg/os/signal/signal_unix.go:27 +0x31

goroutine 10 [finalizer wait]:
runtime.park(0x43fe00, 0x1b70b28, 0x1b6d768)
 /usr/lib/go/src/pkg/runtime/proc.c:1342 +0x66
runfinq()
 /usr/lib/go/src/pkg/runtime/mgc0.c:2279 +0x84
runtime.goexit()
 /usr/lib/go/src/pkg/runtime/proc.c:1394

goroutine 11 [syscall]:
runtime.goexit()
 /usr/lib/go/src/pkg/runtime/proc.c:1394